Tap rule on transformers

[mshields]

Based on Article 240, I am in the habit of making sure my primary OCP and secondary OCP are not more than 25 feet apart.

A colleague is telling me that if your secondary protection is within 10 feet then you're primary protection could be more than 15 feet away from the transformer. In other words, if you're applying the 10 foot tap rule, you need not apply the 25 foot tap rule.

So the bottom line is this; Could you your primary protection be, say, 30 feet away and your secondary protection be less than 10 feet away? Would this be code compliant?

Thanks,

Mike

 

[texie]

Based on Article 240, I am in the habit of making sure my primary OCP and secondary OCP are not more than 25 feet apart.

A colleague is telling me that if your secondary protection is within 10 feet then you're primary protection could be more than 15 feet away from the transformer. In other words, if you're applying the 10 foot tap rule, you need not apply the 25 foot tap rule.

So the bottom line is this; Could you your primary protection be, say, 30 feet away and your secondary protection be less than 10 feet away? Would this be code compliant?

Thanks,

Mike

If I am understanding you correctly, you don't have taps on the primary side. It is a branch circuit with conductors that have to be protected at the source of supply according the ampacity of the conductors and that could be any distance away from the transformer. Maybe I'm missing something here?

 

[don_resqcapt19]

As long as the primary OCPD is sized to protect both the transfomer primary windings (450.3) and the primary conductors, there is no limit on the distance it can be from the transformer.

 

[mshields]

thanks

thanks

very much